Lifting-jack.



G. H. GILMAN' & H. M. ROBERTSON.

LIFTING J AGK. APPLIOATION FILED MAY 1B, 1908.

900,72. Patented 0ct. 13,1908.

UNITED STATES PATENT OFFICE.

GEORGE E. GILMANAND HEN RY M. ROBERTSON, OF ST. PAUL, MINNESOTA.

LIFTING-J'AOK.

j'county of Ramsey and State of Minnesota,

have invented certain new and useful Improvements in Lifting-Jacks; and wedoereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the-art to which it appertains to make and use the same.

Our invention relates to lifting jacks of the character disclosed and broadly claimed in the atent to George H. Gilman, No. 810,482,

- of ate January 23, 1906, and has for its object to improve the same in the several particulars hereinafter noted.

trate the invention, like characters indicate boxes 7.

like parts throughout the several views.

Referring to the drawings, Figure 1 is a view in side elevation, with some arts broken away and some parts sections and some parts in diagram only, showing our improved lifting jack applied to'a car truck. 30

igs. 2 and 3 are side elevations of the improved lifting jack and Fig. .4 is a vertical section taken on the line at m of Fig. 2.

The numeral 1 indicates the rails and the numeral 2 the ties of a railway track.

The numeral 3 indicates the-wheels, the numeral 4 one of the truck frames, and the numeral 5 the body of a car of standard construction.

Referring more in detail to the parts of the car truck, the numeral 6, indicates the axles to which the wheels are rigidly secured. The numeral 7 indicates the-journal boxes and the numeral 8 and 9 indicate, respectively, the bearing brasses and cooperating keys, which parts are of the customar construction and are interposed between t e 'ournalsof the axles 6 and the tops of t e cooperating The lifting jack shown in the prior atent above identified was in the form of a isk or wheel havin an eccentric portion, while the bod 10 of t e present improved lifting jack is o approximately quadrantal form and is provide with an eccentric, and preferably serrated, rim 11. This uadrantal or segmental body 10 is pivotal y connected, pref- Specification of Letters Patent. Application filed Kay 18, 1908. Serial No. 483,461.

Eatented Oct. 13, 1908.

erably by a pin 12, to a bearing head 13, the

upper'surface of which, as shown, is serrated.

At its forward end, the bearing head 13 is provided with an up-turned end or stop lug 14,..and at its rear end is formed with a lug seat 15, which latter, in the position of the parts shown in Fig. 3, is adapted to be engaged by a thrust lug 16 of the body segment 10. To afford a ivotal connection between the parts 10 an 13 which will relieve the pivot pin 12 from heavy strains, the lower portion of the bearing head 13 is bifurcated or formed with laterally spaced approximately semi-circular bearing flanges 13 that embrace an interposed hinge lug or web 10 of the segment 10. Furthermore, the under edges of the flanges 13 engage segmental hearing shoulders 10 formed on the sides of the segment 10 so that the weight of the load on the lifting jack is taken directly between these shoulders and the said bearing flanges 13. p

The extremity 11 of the eccentric rim 11 of the segment 10 is much closer to the axis of the pivot 12 than is the other extremity 11 of said segment. Hence, when the se ment is turned into the position shown in Figs. 1 and 2, the bearing head 13 will be dropped muchlower down than when said segment is turned into the position shown in Fig. 3. Preferably, when the jack is applied to lift a car frame, the eccentric rim of the segment 10 is placed upon a plank 17 supported by the ties and the head 13 is applled to the bottom of one of the boxes of said truck frame, as shown in Fig. 1. Of course, when the jack is applied, the segment is turned into the position shown in Figs. 1 and 2. Then, when the car is moved forward or in a direction from the left toward the right in respect to Fig. 1, the lifting seg ment will be moved into the position shown in Fig. 3, thereby raising the axle box to which it is a plied so as to permit its boarmg brass 8 and lley 9 to be easily removed-from the box and others, if desired, replaced therein. When the segment reaches its extreme position shown in Fig. 3, the lug 16 of said segment en ages the seat 15 of the bear ng head 13 an thereby locks the-said bearing head against endwise sliding movements on the segment, so as to relieve the pivot pin 12 from undue strains. In fact, when the lug 16 engaged with the seat 15 as just described, a new or additional oint of support between the segment and caring head is established, and this, by preventing crowding of the bearing flanges 15 of the bearing head on the shoulders 10 of the segment 10, prevents shearing of the pivot pin 12.

From what has already been said it will be understood that the bearing rim of the segment 10 is eccentric from one extremity to the other; that is, from the extremity 11 its distance constantly increases toward and to the extremity 11 so that there will be a continued li'l't throughout the oscillatory movement of the segment. It is also evident that the bearing head 13, in both extreme positions, is brought into solid engagement with one or the other of the approximately radial edges of the segment 10, so that oscillatory movement of the said lifting segment, when applied in working position, is limited to approximately 90 degrees, altl'iough, of course, this feature is capable of considerable variation.

What we claim is:

1. A lifting jack com rising a segment and a bearing head pivota ly connected thereto and having engaging bearing flanges and shoulders, and 006 erating stop surfaces for limiting the pivotafmovements of said parts in respect to each other, the said segment having an eccentric rim portion, the dis tance of which between the pivotal connection of the two elements increases from one extremity to the other of the said rim, substantially as described.

2. In a lifting ack, the combination with a segment 10 having an eccentric bearing rim 11 and formed with a hinge lug 10 and with segi'nental bearing shoulders 10*, of a bearing head 13 having laterally spaced bearing flanges 13 embracing and pivotally connected to said lug 10 and engaging said shoulders 10 substantially as described.

3. In a lifting 'ack, the combination with'a lifting segment aving an eccentric bearing rim, of a bearing head ivotally connected to said segment, one of t 1e said parts having a lug and the other a cooperating seat located eccentricto the pivotal connection between the two parts and adapted to be en gaged when said segment is moved into one extreme position, substantially as described.

4. In a lifting jack, the combination with a lifting segment 10 having an eccentric rim 11 and provided with a hinge lug 10, hearing shoulders 10 and lugs 16, oi a bearing head 13 having laterally spaced bearing flanges 13 that embrace and are pivotally connected to said lug 10 and engage with the said shoulders 10*, the said head further ha ving a seat 15 adapted to be engaged by the lug 16 when said segment 10 is moved into an extreme li'l'ting position, substantially as described.

In testimony whereof we allix our signatures in presence of two witnesses.

GEORGE H. GILM AN. HENRY M. ROBER'ISUN Witnesses IIARRY D. KILGORE, MALIE Horn. 

